* assign default port to 9091 as the documented

* bug fix in printing RuntimeError and add an additional search path

* pretty print rebuild runtime args

* PRC => RPC

* replace vta_config.json file path

`build/vta_config.json` => `vta/config/vta_config.json`

* undo the change in adding lib_search path

* search vta_config.py file in vta/config

* avoid exposing driver function calls, and use predefined `VTAMemGetPhyAddr` instead.

* rename `tests/hardware/pynq` => `metal_test`

* set config path back to `build` dir

* [NNVM] Fix check in layout parsing

* add one workload

* updated readme files to avoid stale instructions

* bsp generation turned off by default

* bug fix for new drivers in new PYNQ image v2.1

* updating instructions for resnet inference

* updated the instructions for starting the RPC server

* deriving host/port from env for unit tests

* fix graph transform for batch dimension

* fix

* fix

* removing programming out of end to end example for now

* updating TOPI library to use gemm tensor intrinsic

* bug fix, autoschedule in TOPI conv lib

* removing the deprecated GEVM intrinsic

* refactoring, fixed lint test

* fix for integer division bug

* python3 bug fix for non matching types due to float division

* comment